Zenoss Core is today's premier, open-source IT monitoring solution. Using a single, web-based console and agentless technology, you can monitor and manage the performance and availability of all devices in your IT infrastructure (network, server, storage, applications, converged infrastructure, virtualization/cloud).
The power of Zenoss Core begins with its in-depth IT inventory and configuration database. Zenoss creates this database by discovering managed resources -- networks, servers, storage, and other devices -- in your IT environment.
Once Zenoss Core discovers the IT infrastructure, it automatically begins monitoring the performance of each device and provides event and fault management capabilities. These capabilities help drive IT operational efficiency and productivity by automating many of the monitoring, notification, alert, escalation, and remediation tasks you perform each day.

ADempiere Business Suite ERP/CRM/MFG/SCM/POS done the Bazaar way in an open and unabated fashion. Focus is on the Community that includes Subject Matter Specialists, Implementors and End-Users. We forked and survived Compiere which is now closed.

Onix ERP/CRM is an easy to use web application to manage your business (contacts, invoices, orders, products, stocks, agenda, emailings, etc...) for small and large company.
It's an opensource and free web application for developers and freelancers. You can install and use it as a standalone application, or online on a mutualized or dedicated server to use it from anywhere.
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Latest version : 0.2 alpha

Team Elements is an Enterprise 2.0 team collaboration suite. It ties discussions, wikis, RSS, project and document management, and federated search into a unified application. It is database-driven with rigorous role-based access and permissions.

Conflux is a data collection and management suite, designed to aid the user in performing searches and managing the search results in a manner which may be useful for a team or workgroup. Searches, search results and manually-entered URLs may be bundled